In order to examine sensitivity of cumulus convective parameterization scheme in climate simulating over the Heihe River Basin(HRB), three cumulus parameterization schemes in Regional Integrated Environmental Model System for HRB(RIEMS-Heihe) with 3km resoultion, Grell, Bett-Miller (BM) and NON were compared and analyzed in precipitation simulation over HRB. The analysis results showed the following: ①BNU daily precipitation in the whole of the HRB was underestimated than the observed precipitation.②Either cumulus convective parameterization schemes, model could simulate the spatial distribution and temporal evolution of daily precipitation in different regions of HRB, and the correlation coefficient between the simulated and observed daily precipitation reached a significance level of 1%. ③For the HRB, RIEMS Heihewith the Grellcumulus convective parameterizationscheme than the other two schemes in term of evolution of daily precipitationis was closer to that of the observation, and the correlation coefficient between the simulated and observed daily precipitation reached a significance level of 1%.